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Large scale cleaning has been carried out on the polluted sea area following the oil pipeline explosion at a harbor in Dalian. Local authorities say they've stopped the oil spill from reaching high seas, admitting the clean-up work was "arduous."
Despite efforts to clean the sea area for ten days, oil could still be seen on some beaches.
The oil coverage has shrunk from 50 to 30 square kilometers, and the water quality has been greatly improved in the polluted area.
Dalian government says workers have contained the oil slick, stopping it from reaching the high seas.
It says some of the slick has been mopped up, but it's not easy to get rid of the rest.
The clean-up has involved more than 250 oil-skimming vessels and more than 8,000 fishing boats.
Maritime agencies and oil companies have laid down more than 40,000 meters of oil barriers and 65 tons of oil absorbent mats.
An explosion hit an oil pipeline on July 16th triggering a blast at an adjacent smaller pipeline near Dalian New Port. Both pipelines are owned by China's No.1 oil and gas producer CNPC.
Investigations show that incorrect injections of strongly oxidizing desulphurizer into the oil pipeline after a 300,000-tonne tanker had finished unloading its oil caused the explosion.